CN110950542A - Preparation method of flexible ultrathin glass substrate for folding mobile phone cover plate - Google Patents
Preparation method of flexible ultrathin glass substrate for folding mobile phone cover plate Download PDFInfo
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- CN110950542A CN110950542A CN201911379256.7A CN201911379256A CN110950542A CN 110950542 A CN110950542 A CN 110950542A CN 201911379256 A CN201911379256 A CN 201911379256A CN 110950542 A CN110950542 A CN 110950542A
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- glass substrate
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C15/00—Surface treatment of glass, not in the form of fibres or filaments, by etching
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C21/00—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface
- C03C21/001—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions
- C03C21/002—Treatment of glass, not in the form of fibres or filaments, by diffusing ions or metals in the surface in liquid phase, e.g. molten salts, solutions to perform ion-exchange between alkali ions
Abstract
The invention relates to a preparation method of a flexible ultrathin glass substrate for folding a mobile phone cover plate. It comprises the following steps: (1) directly carrying out two-sided chemical etching on the glass substrate with the thickness of 0.3-0.5mm to obtain a glass substrate with the thickness of 0.2 mm; (2) adhering 0.2mm glass base materials to two sides of a supporting substrate, and adhering the glass base materials into a substrate unit by using ultraviolet curing hydrolysis glue; (3) coating edge sealing glue on the end faces of the four edges of the substrate unit; (4) then, carrying out second single-side chemical etching to prepare a glass substrate unit with the thickness of 0.04mm to 0.07 mm; (5) and soaking the glass substrate unit in hot water of 80-85 ℃, and peeling off the support substrate to obtain the flexible ultrathin glass substrate. The thickness of the glass sheet can be reduced to 0.04mm, so that the requirements of the flexible ultrathin glass substrate are met, the requirements of thickness uniformity and surface quality are met, and the glass sheet can be completely used as the flexible ultrathin glass substrate of the folding mobile phone cover plate.
Description
Technical Field
The invention relates to a preparation method of ultrathin glass, in particular to a preparation method of a flexible ultrathin glass substrate for folding a mobile phone cover plate.
Background
The Glass substrates currently used for display devices mostly have a thickness in the range of 0.1mm to 0.7mm, and those having a thickness of less than 0.4mm are called Ultra-Thin Glass (Ultra-Thin Glass). Glass with a thickness of less than 0.2mm is known in the industry as flexible ultra-thin glass due to its remarkable flexibility characteristics, such as being bendable or even rollable. A display screen made of flexible ultra-thin glass is called a flexible screen to be distinguished from a rigid hard screen. The flexible outer glass protection sheet matched with the flexible screen is called a flexible ultrathin glass cover plate. The size of the flexible ultrathin glass cover plate used for smart phones and the like is generally in the range of 6-8 inches, and the manufacturing size of the flexible ultrathin glass substrate is relatively large in consideration of production efficiency, for example, the size of 400 x 500mm or more is selected. Glass manufacturers in the industry, glass material manufacturers known in the world such as corning, Xue glass, electronic glass and the like can directly produce glass substrates in batches by using the traditional process, the thickness of the glass substrates is 0.2-0.4 mm at the thinnest, and the requirements of flexible ultrathin substrates cannot be directly met.
The chemical etching and thinning method is also adopted to prepare flexible ultrathin glass plates. Because the flexible ultrathin glass sheet is easy to break and cannot be polished by a polishing machine, the requirements on the design and implementation of the process of chemical etching and thinning processing are extremely high. The chemical etching thinning method mainly comprises a soaking mode and a top spraying mode at present, wherein the soaking method cannot manufacture ultrathin glass with the thickness of less than 0.2mm, because after the glass is soaked in acid liquor for etching, the surface of the glass is stressed by liquid and the inside of the glass also generates uneven stress, and when the etching is finished and the glass leaves the acid liquor, the glass is easy to crack due to the release of the internal stress of the glass. Compared with the prior art, the top-spraying etching mode adopts a structure that the top part sprays rain mist etching liquid uniformly at high speed, and during etching, because a fast flowing acid liquid thin layer is formed on the surface of the glass, the etching speed is uniform, the pressure of the etching liquid on the glass is extremely small, and the stress distribution on the surface of the glass substrate is consistent, so that the glass is not easy to damage. The top-spray technique must first ensure that the ultra-thin glass remains upright under the impact of the acid and is able to withstand the vibrations generated by the etching solution. The glass sheet with the thickness of less than 0.2mm has obvious flexibility, so when the glass sheet is erected, the glass sheet can be bent under the action of gravity, and the etching effect is directly influenced. Therefore, the flexible ultrathin glass preparation technology is also considered as a technical problem which cannot be solved by the industry.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for preparing a flexible ultrathin glass substrate for folding a mobile phone cover plate, which can reduce the thickness of a glass sheet to 0.04mm so as to meet the requirements of the flexible ultrathin glass substrate and meet the requirements of thickness uniformity and surface quality.
The technical scheme of the invention is realized as follows: a preparation method of a flexible ultrathin glass substrate for folding a mobile phone cover plate comprises the following steps:
(1) directly carrying out two-sided chemical etching on the glass substrate with the thickness of 0.3-0.5mm, and thinning the glass substrate into the glass substrate with the thickness of 0.2 mm;
(2) adhering a glass substrate with the thickness of 0.2mm to two sides of a supporting substrate by using ultraviolet curing hydrolytic adhesive to form a group of 3 combined substrate units;
(3) coating edge sealing glue on the end faces of the four edges of the combined substrate unit;
(4) carrying out secondary single-sided chemical etching on the combined substrate unit, and thinning the glass adhered on the supporting substrate into flexible ultrathin glass with the thickness of 0.04 mm-0.07 mm;
(5) and soaking the combined substrate unit subjected to secondary thinning in hot water at the temperature of 80-85 ℃, and stripping the support substrate to obtain the flexible ultrathin glass substrate. The obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet. This can improve the flexibility and impact resistance of the flexible ultrathin glass substrate.
Another better technical scheme of the invention is as follows:
(1) directly carrying out two-side chemical etching on a glass substrate with the thickness of 0.3-0.5mm to obtain a glass substrate with the thickness of 0.2 mm;
(2) directly adsorbing and attaching 0.2mm to two sides of a supporting substrate, and sealing the edges by using an acid-resistant adhesive tape to prepare a combined substrate unit;
(3) carrying out secondary single-sided chemical etching on the combined substrate unit, and thinning the glass adhered on the supporting substrate into flexible ultrathin glass with the thickness of 0.04 mm-0.07 mm;
(4) and removing the acid-resistant adhesive tape on the glass substrate unit to obtain the flexible ultrathin glass substrate. The obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet. This can improve the flexibility and impact resistance of the flexible ultrathin glass substrate.
The method is simpler, more convenient and more efficient than the previous method because the UV curing adhesive is not used between the supporting plate and the substrate to be processed.
The method has simple process and high yield, and can completely realize industrial production. The support substrate is adopted and the etching process is divided into two times, so that the problem that the flexible ultrathin glass is deformed in the etching process is solved, the problem that the two sides of the glass are warped due to uneven stress possibly caused by the whole single-side etching is solved, the produced flexible ultrathin glass substrate can meet the requirements of flexibility, ultrathin property and smooth surface, and can be completely used as the flexible ultrathin glass substrate of the folding mobile phone cover plate.
Drawings
FIG. 1 is a process diagram of the present invention.
FIG. 2 is a schematic view of another method of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
The first embodiment is as follows: bonding a substrate to be processed to a supporting substrate using a UV-curable hydrolytic adhesive using the supporting substrate
As shown in fig. 1, firstly, a glass sheet base material is selected, the size range is 400 x 500 mm-700 x 900mm, the initial thickness range is 0.2 mm-0.7 mm, and the thickness of the base material is adjusted to be 0.2mm by a common double-sided thinning mode; a high-flatness substrate (the material can be glass or high-strength plastic, and the thickness can be 0.3-1.0 mm) with common thickness is used as a supporting substrate, glass substrates to be treated are pasted on two side surfaces of the supporting substrate, and UV curing hydrolysis glue is used as a pasting material to prepare a combined substrate unit. After the adhesive layer is adhered, the substrate unit is pressed tightly by a rubber roller and other tools, and air bubbles possibly appearing in the rubber layer are removed. Curing the UV glue by UV light irradiation, and bonding the substrate units together to form a combined substrate which is used as a workpiece unit for subsequent thinning treatment;
and coating edge sealing glue on the end faces of the four edges of the attached substrate, and irradiating by using UV rays to solidify the edge sealing glue, wherein the edge sealing glue is required to be acid-resistant and has no hydrolyzability. The treatment has the functions of preventing the etching solution from permeating into the space between the glass sheets through the edge and preventing the etching solution sprayed from the top of the equipment from generating excessive impact on the edge of the glass to cause the edge sawtooth phenomenon; then the bonded substrate is placed into a top-spraying etching machine, and the substrate to be processed is thinned to the specified ultrathin thickness (0.2 mm-0.04 mm) through a chemical etching process. And after the etching and thinning are finished, removing the edge sealing glue on the four edges to obtain a combined unit with the flexible glass substrate attached to the two sides of the support plate. And soaking the glass substrate in hot water at the temperature of 80-85 ℃ for 30-60 minutes to ensure that the hydrolytic glue absorbs water and loses viscosity, and the ultrathin glass is separated from the supporting plate, so that the flexible ultrathin glass substrate is obtained. The obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet.
In the etching and thinning process, the bonded substrate can keep good standing property and impact resistance in the etching process due to the function of the supporting substrate, and the surface of the substrate to be processed, which is in contact with the etching solution, is etched and thinned in a single surface under the washing of the etching acid solution.
Example two: bonding a substrate to be processed to a supporting substrate using an acid-resistant adhesive tape using the supporting substrate
As shown in fig. 2. Firstly, selecting a glass sheet base material with the size range of 400-700-900 mm and the initial thickness range of 0.2-0.7 mm, and adjusting the base material to be the glass base material with the thickness of 0.2mm in a common double-sided thinning mode in advance;
the method comprises the steps of using a high-flatness substrate (the material can be glass or high-strength plastic, and the thickness can be 0.3-1.0 mm) with common thickness as a supporting substrate, directly adsorbing and attaching the substrate to be processed on two sides of the supporting substrate, sealing the edges of four sides with acid-resistant adhesive tapes, attaching the three substrates together to form a combined substrate, and using the combined substrate as a workpiece unit for subsequent thinning processing. Because the UV curing glue is not used between the substrates to be processed of the supporting substrate, the method is simpler, more convenient and more efficient than the method I;
then the substrate unit is put into a top-spraying etching machine, and the substrate unit to be processed is thinned to a specified ultra-thin thickness (0.2 mm-0.04 mm) glass substrate unit through a chemical etching process. And after the etching and thinning are finished, removing the sealing adhesive tape on the edge, and naturally separating the processed ultrathin glass from the supporting substrate to obtain the single flexible ultrathin glass substrate. The obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet.
Due to the function of the supporting substrate, the bonded substrate can keep good standing property and impact resistance in the etching process, and the surface of the substrate to be processed, which is in contact with the etching solution, is thinned by single-sided etching under the washing of the etching acid solution.
Claims (4)
1. A preparation method of a flexible ultrathin glass substrate for folding a mobile phone cover plate comprises the following steps:
(1) directly carrying out two-sided chemical etching on the glass substrate with the thickness of 0.3-0.5mm to obtain a glass substrate with the thickness of 0.2 mm;
(2) adhering 0.2mm glass base materials to two sides of a supporting substrate, and adhering the glass base materials into a substrate unit by using ultraviolet curing hydrolysis glue;
(3) coating edge sealing glue on the end faces of the four edges of the substrate unit;
(4) then, carrying out second single-side chemical etching to prepare a glass substrate unit with the thickness of 0.04mm to 0.07 mm;
(5) and soaking the glass substrate unit in hot water of 80-85 ℃, and peeling off the support substrate to obtain the flexible ultrathin glass substrate.
2. The method for manufacturing a flexible ultra-thin glass substrate for a folding cellular phone cover according to claim 1, further comprising the steps of: the obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet.
3. A preparation method of a flexible ultrathin glass substrate for folding a mobile phone cover plate comprises the following steps:
(1) directly carrying out two-sided chemical etching on the glass substrate with the thickness of 0.3-0.5mm to obtain a glass substrate with the thickness of 0.2 mm;
(2) directly adsorbing and attaching 0.2mm to two sides of a supporting substrate, and sealing the edges by using an acid-resistant adhesive tape to prepare a substrate unit;
(3) coating edge sealing glue on the end faces of the four edges of the substrate unit;
(4) then, carrying out second single-side chemical etching to prepare a glass substrate unit with the thickness of 0.04mm to 0.07 mm;
(5) and removing the acid-resistant adhesive tape on the glass substrate unit to obtain the flexible ultrathin glass substrate.
4. The method for manufacturing a flexible ultra-thin glass substrate for a folding mobile phone cover plate according to claim 3, further comprising the steps of: the obtained flexible ultrathin glass substrate was immersed in a molten potassium nitrate solution at a temperature of 420 to 450 ℃ to cause diffusion exchange between K ions in the molten potassium nitrate salt and Na ions in the glass, thereby forming a compressive stress layer having a thickness of 10 μm on the surface of the flexible glass sheet.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679101A (en) * | 2020-12-25 | 2021-04-20 | 安徽金龙浩光电科技有限公司 | Glass with different thicknesses and processing technology thereof |
| CN113121121A (en) * | 2021-04-01 | 2021-07-16 | 江西沃格光电股份有限公司 | Mobile terminal, flexible display screen, glass cover plate and processing method thereof |
| CN113696566A (en) * | 2021-08-16 | 2021-11-26 | 张志才 | Preparation process and equipment of ultrathin flexible glass lamination |
| CN113820876A (en) * | 2021-09-22 | 2021-12-21 | 合肥京东方光电科技有限公司 | Display panel thinning method, display panel and display device |
| CN114213029A (en) * | 2021-12-24 | 2022-03-22 | 凯盛科技集团有限公司 | Automatic production process for chemical thinning of flexible glass |
| CN114380510A (en) * | 2021-12-24 | 2022-04-22 | 凯盛科技股份有限公司 | Preparation process of foldable flexible glass |
| CN114394759A (en) * | 2021-12-24 | 2022-04-26 | 凯盛科技股份有限公司蚌埠华益分公司 | Glass single-side thinning method and glass thinning equipment |
| CN114436547A (en) * | 2022-03-09 | 2022-05-06 | 长沙汇意圆科技有限公司 | Manufacturing and processing method of flexible glass product |
| CN114605081A (en) * | 2022-04-27 | 2022-06-10 | 江西沃格光电股份有限公司 | Preparation method of ultrathin glass with low fragment rate |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112679101A (en) * | 2020-12-25 | 2021-04-20 | 安徽金龙浩光电科技有限公司 | Glass with different thicknesses and processing technology thereof |
| CN113121121A (en) * | 2021-04-01 | 2021-07-16 | 江西沃格光电股份有限公司 | Mobile terminal, flexible display screen, glass cover plate and processing method thereof |
| CN113696566A (en) * | 2021-08-16 | 2021-11-26 | 张志才 | Preparation process and equipment of ultrathin flexible glass lamination |
| CN113820876A (en) * | 2021-09-22 | 2021-12-21 | 合肥京东方光电科技有限公司 | Display panel thinning method, display panel and display device |
| CN114213029A (en) * | 2021-12-24 | 2022-03-22 | 凯盛科技集团有限公司 | Automatic production process for chemical thinning of flexible glass |
| CN114380510A (en) * | 2021-12-24 | 2022-04-22 | 凯盛科技股份有限公司 | Preparation process of foldable flexible glass |
| CN114394759A (en) * | 2021-12-24 | 2022-04-26 | 凯盛科技股份有限公司蚌埠华益分公司 | Glass single-side thinning method and glass thinning equipment |
| CN114394759B (en) * | 2021-12-24 | 2023-08-01 | 凯盛科技股份有限公司蚌埠华益分公司 | Glass single-sided thinning method and glass thinning equipment |
| CN114436547A (en) * | 2022-03-09 | 2022-05-06 | 长沙汇意圆科技有限公司 | Manufacturing and processing method of flexible glass product |
| CN114605081A (en) * | 2022-04-27 | 2022-06-10 | 江西沃格光电股份有限公司 | Preparation method of ultrathin glass with low fragment rate |
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